Holland, A. S. B., Sahney, B. N. and Tzimbalario, J. (1976) “On Best Simultaneous Approximation”, The Journal of the Indian Mathematical Society, 40(1-4), pp. 69–73. Available at: http://www.informaticsjournals.com/index.php/jims/article/view/16614 (Accessed: 9 May 2024).